When I select the marque tool and then select an area on a photo and hit the delete key that portion of the photo is deleted. However, the marque outline remains and does not go away until I save and reopen the file. Can anyone let me know what I'm doing wrong?

Have you tried CTRL+D? I'm not sure about PSE 10, but in PSE 9 that's the shortcut to deselect the marching ants. I'm guessing it's probably the same for PSE 10. You could also just go to Select>Deselect in the menu bar at the top of the screen. HTH

When I select the marque tool and then select an area on a photo and hit the delete key that portion of the photo is deleted. However, the marque outline remains and does not go away until I save and reopen the file. Can anyone let me know what I'm doing wrong?

When I select the marque tool and then select an area on a photo and hit the delete key that portion of the photo is deleted. However, the marque outline remains and does not go away until I save and reopen the file. Can anyone let me know what I'm doing wrong?